David Imbrogno
asked on
Duplicate DNS entries
I have duplicate DNS entries on my server (two machines with the same DNS given out by the server). Generally one DNS entry is several months old and the other is newer. How do I correct this other than just deleting the older one? How do I prevent this from happening again?
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Two machines have the same IP address. Both assigned by DHCP. DHCP scope is 10.10.248.1 through 10.10.253.254
And you only have one DHCP server? And only one scope?
ASKER
Yes Only one DHCP server and one scope. I do have two DNS servers however
Two machines have the same IP address. Both assigned by DHCP.
This is a separate issue from the one in your original question. DNS records that are inaccurate because they're several months out of date can be fixed by scavenging, but this is a DHCP problem. Please run ipconfig /all on both of those machines and confirm whether they were both assigned by the same DHCP server and have overlapping lease times.
ASKER
The machines appear to have had the IP addresses assigned by the same DHCP server and they do have overlapping lease times
I have no idea how that could happen. Once a DHCP server has leased an address to a client, it should never lease that same address to another client while the original lease is still active; that's one of the core principles of DHCP. Do both leases show up in the DHCP console?
Is your DHCP server a Windows server, BTW, or something else?
Is your DHCP server a Windows server, BTW, or something else?
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ASKER
Thank you for the help. I will set up DNS scavenging and see what happens.
In the first case, are both machines DHCP clients? Only one? Neither?
In the second case, is the machine a DHCP client?
What is your DHCP scope?